Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32e18563e9364009f121c843f9413f31812c17797472ff2f21ecd4e9f19aad6' 
  AND token = '8R8aO/AIK2LXVzvILnbxWLIe2QUeev2rrs8sLdDPvZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}